"And in violent cases of mania, where the mind is shut up within itself, and cannot, from impotence, perceive what is without, it is as sure of the most chance fancy, as in health it would be of the best proved truths."

"They are all from various causes "adhesive" states--states which it is very difficult to get rid of, and which, in consequence, have retained their power of creating belief in the mind, when other states, which once possessed it too, have quite lost it."